Karst Cave, China

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Karst Cave, China

Photograph by Raymond Gehman

Looking like the set of a science fiction movie, China's Reed Flute Cave is bathed in purple-blue light. Created by an underground river more than a half million years ago, this highly accessible karst formation is one of the region's most popular tourist attractions. But during World War II the cave served a different purpose—it doubled as an air raid shelter.